import express from "express";
import cors from "cors";
import helmet from "helmet";
import morgan from "morgan";
import { config } from "./src/config/index.js";
import { db } from "./src/db/knex.js";
import { qdrant } from "./src/services/qdrantClient.js";
import { authMiddleware } from "./src/middleware/auth.js";
import { rateLimitMiddleware } from "./src/middleware/rateLimit.js";
import { errorHandler } from "./src/middleware/errorHandler.js";
import { apiRouter } from "./src/routes/index.js";

export function createApp() {
  const app = express();

  app.disable("x-powered-by");
  app.use(helmet());
  app.use(
    cors({
      origin: config.corsOrigin,
      credentials: true
    })
  );
  app.use(express.json({ limit: "10mb" }));
  app.use(morgan("dev"));

  app.get("/health", async (_req, res) => {
    const checks = { api: true, db: false, qdrant: false, ollama: false };

    try {
      await db.raw("SELECT 1");
      checks.db = true;
    } catch {}

    try {
      await qdrant.getCollections();
      checks.qdrant = true;
    } catch {}

    try {
      const r = await fetch(`${config.ollama.url}/api/tags`, { signal: AbortSignal.timeout(3000) });
      checks.ollama = r.ok;
    } catch {}

    const ok = Object.values(checks).every(Boolean);
    res.status(ok ? 200 : 503).json({ ok, checks });
  });

  app.use("/api", rateLimitMiddleware, authMiddleware, apiRouter);

  app.use(errorHandler);

  return app;
}